It can be done, but the results will be disappointing because:
a) The chrome plate will shrink the bore and grooves to a smaller diameter than your original - so you won't be able to shoot it without causing excessive pressure.
b) The chrome plate (if applied to the chamber) will tighten up headspace and the neck so that (if you're lucky) rounds can't even be chambered or (if you're not so lucky) rounds CAN be chambered on a tight neck. That plus the tight bore is begging for a KB.
c) Chromed bores have the rifling cut differently before chroming so the plate "fills in" leaving relatively sharp land and groove corners. Without the pre-chrome rifling, you end up with rounded lands and grooves.
So, chroming an existing non-chromed, finished barrel is a great way to ruin it! Unless you plan to shoot corrosive ammo and never clean it, why the need for chrome?